West residents make their way back to the blast zone

LM Otero/Associated Press

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Firefighters set a brace to hold up a sagging beam during a search and rescue operation at an apartment complex destroyed by an explosion at a fertilizer plant in West, Texas, Thursday, April 18, 2013. A massive explosion at the West Fertilizer Co. killed as many as 15 people and injured more than 160, officials said overnight. The explosion that struck around 8 p.m. Wednesday, sent flames shooting into the night sky and rained burning embers and debris down on shocked and frightened residents. (AP Photo/Tony Gutierrez)

Firefighters set a brace to hold up a sagging beam during a search and rescue operation at an apartment complex destroyed by an explosion at a fertilizer plant in West, Texas, Thursday, April 18, 2013. A massive explosion at the West Fertilizer Co. killed as many as 15 people and injured more than 160, officials said overnight. The explosion that struck around 8 p.m. Wednesday, sent flames shooting into the night sky and rained burning embers and debris down on shocked and frightened residents. (AP Photo/Tony Gutierrez)